How does a guy know he is starting puberty and can produce sperm?
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A couple of ways on puberty.
Usually the penis and testes start to get bigger. Pubic hair will begin to make an appearance. The voice may deepen but usually doesn't "break" yet.
As for semen, you'll wake up one day with a sticky mess in your underwear or you'll find out by masturbation.
Just remember, not everyone develops at the same rate and not everything happens at the same time. Everyone is different.
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